The motion for protective order has to be ruled on. He can't just refuse to answer, no. You need to look at the rules. If it is in state court the rules can be found at www.flabar.org go to professional practice, rules of procedure. If you are in federal court, there are both federal and local rules.
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A motion for protective order has no effect unless it has been ruled upon.
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Because it is a non-party, I would definitely first resolve the motion for protective order. If the other side does not schedule the motion for a hearing, then be proactive and set the motion for hearing.